Dynamo-electric machine.



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PATENTBD DBG. 10, 1907.

No. 873,072v

J. E. NOEGGERATH. DYNAMO ELECTRIC MACHINE.

APPLICATION FILED SEPT. 22,1905.

2 SHEETS-SHEET L JQ/robE/Vo No. 873,072. d PATENTED DEC. 1o, 1907. J. E. NCECCEEATE.

DYNAMC ELECTRIC MACHINE.

APPLICATION TILED SPT.22, 1905.

2 SHEETS-SHEET 2.

/ l A 0 al W/nesses. /m/entof? 1 u@ M, (/a/foE/voeggemE/z Y No. 873,072.

h To all whom it may concern.'

Be it knowm that I, JAKOB E. NOEGGE- RA'iH, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Dynamo- Electric Machines, of which the following is a specification.

My invention relates to dynamo-electric 1 10 machines, particularly to machines of the y unipolar type, and its object is to provide a 5, novel construction of the rotating member Y adapted to afford thorough ventilation and :gig cooling.

`15 My invention consists in forming the rotor body of superposed cylindrical members shaped so as to form an air-chamber within the body of the rotor and provided with passages extending to the surface of the rotor. With this construction free passa es are afforded for air through thebody ofg the rotor,

fvjand since this air is thrown outward by cen- `trifugal force when the machine is running thorough ventilation is obtained.

The arra vement described above is partic- 'I ularly suite for use in unipolar machines, 'since in this type of machine the rotor is in a uniform field and consequently does not need to be built up of laminations as in an ordinary l'multi olar machine, but may be constructed o solid castings. When this construction is employed in 'a unipolar machine radial passages from the air-chamber or chambers within the rotor body may be A "arranged with their outer ends adjacent to thej collector rings, so as to afford efficient c'oolinflr for the rings, which in operation are heateda not only by the current passing through them but also by brush friction. y My invention will best be understood by reference to the accompanying drawings, in

which Figure 1 shows a side elevation partly in l cross-section of a unipolar machine arranged 'f 45 in accordance with my invention; and Figs. 2, 3 and 4 show cross-sections of the' rotor body on the dotted lines 2 2, 3-3 and 4-4, res ectively, of Fig. 1. l

n the'drawings F represents the unipolar filed structure provided with energizing coils A S Jiepresents the armature shaft .which carries two cylindrical castings A1 side by Specification of Letters Patent.

Application filed September Z2. 1905. Serial No. 279.624.

side, only one of which is shownin, a5

UNITED STATES PATENT oiivicE.

JAKOB E. NOEGGERATH, OF SGHENEGTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

. DYNAMIC-ELECTRIC MACHINE.

Patented Dec. 10, 1907.-

the two castings are just alike; the rotor beingv .l

symmetrical in every way. Each of these castings is formed with an outer surface of three di'crent diameters, as is clearly shown in Fig. Su erposed on each casting A1 is a second lin "cal casti A, the inner sur- 60 face of which is formed with three different diametersLthe diameters of the end portions"v corresponding with the outer diameters of the end portions ofthe casting A1, but the di` ameter of the central portion beinggreater A' Y than the outer diameter of the centralpor tion of the casting A1. Thus an air chamber' a is formed between the castings A" and A intermediate their length. Axial passages aextend outwardly from the chamber a to the 7077 j` f ,5 l

surface of the casting Al and similar passages a2 extend from the chamber a throughwfthe a measure and prevent the flow of eddy currents which might be caused .by a somewhat uneven distribution of the field flux.

A4 represents a ring surrounding the conductors C and holding them in place against centrifugal force.

c represents the collector rings at each end of the armature to which the armature conductors are' connected and by means of which the armature current may be led ofr` through suitable brushes, not shown. Y 95 With a construction' as shown it will be seen that as the machine revolves, air will be drawn axially through the body of the armature into the air chamber a and expelled by centrifugal force through the radial passages a3. This air serves not only to cool and ventilate the' rotor structure, but also to cool the collector rin s. y

I do not esire to limit myself to the particular arrangement of parts here shown, but aim in the appended claims to cover all modifications which are Within the scope of my invention; Y

What I claim as new, and desire to secure by Letters Patent of the United States, is,-

' 1. In a dynamo-electric machine, a rotor body compris' two superposed cylindrical members sha ,so as to form a chamber intermediate t eir lengths and provided with holes exten from said chamber to th surfaces of sai members.

2. In a dynamo-electric machine, a rotor body comprising two superposed cylindrical members enga each other near their ends and separated om eachother near their centers so as to forman air chamber, and having substantiall axial and substantially radial holes exten 'ngfrom said chamber to the surfaces of said members.

3. .In-a' dynamo-electric machine, a rotor body compris a cylindrical member having an outer siiiace of three different diameters, and asuperposed cylindrical member having inner diameters corresponding to the outer diameters of the end portions of the first member, but greater than the outer diameter of the intermediate portion of the first member, so as to form a central chamber between said members, said membershavi substantially axial and substantially radia holes extending from said chamber to the s urfacesof said members.

h f1; In a unipolar generator, an armature comprising two superposed cylindrical memt" s l j bers shaped so as to form a chamber intermediate their lengths and provided with holes A extending from said chamber to the surfaces of said members, and collector carried by the outer member adjacent to the outer ends of a portion of said holes.

5. In a dynamo-electric machine, a symmetrical rotor body made up of two similar halves placed end to end, each half comprising two superposed cylindrical Amembers shaped so as to fit together and form a chamber intermediate their lengths and provided with holes extending longitudinally from said chambers to the end surfaces of said members.

6.- In a d amo-electric machine, a symmetrical bo y made up of two similar halves placed end to end, each half comprising a cylindrical member having an outer'surface of three' different diameters, and 'a superposed cylindrical member having inner diameters corresponding to the outer diameters of the end portions of the first member, but greater than the outer diameter of the intermediate portion of vthe first member, so as` to form a Vcentral chamber betweenfsaid members, said members ha substantially axial and substantially radial oles extending from said chambers to the periphery and en surfaces of said body.

In witness whereof, I have hereunto set my hand this 19th day of September, 1905. JAKoB E. laoiaeernmiTH.l

Y Witnesses:

HELEN ORFORD,

E. C. HoLLIsTER. 

